Adjustable high-chair for children



FIG. 1 is a perspective view of the adjustable high-chair for children, showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a view thereof, taken from one side; and,

FIG. 5 is a top view thereof. 

The ornamental design for "adjustable high-chair for children", as shown and described. 